Engine-lathe



(No Modeli) J RICHARDS. 4

ENGINE LATHE.

Patented May 16,1882. I

v Zjiyentm N. PETERS, Pmwum hun Walhinglon. no,

UNITED STATES PATENT OFFICE.

JOHN RICHARDs, on elm FRANCISCO, CALIFORNIA.

ENGlNE-LATH E.

SPECIFICATION forming part of Letters Patent No. 258,121, dated May 16, 1882.

Application filed January 17, 1882. (No model.)

California, have invented certain new and useful Improvements in Engine-Lathes, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to engine-lathes; and it consists in a new and simple method of operatin g the carriages of such lathes by means of two or more tangent gear-wheels meshing into' the lead-screwfand so arranged as to perform four functions-namely, to support the screw from flexure, to answer as a rack and pinion for moving the carriage, as a nut for feeding the carriage, and as an instantaneous friction feed motion that starts at any point, as hereinafter more fully described.

In the annexeddrawings, Figure 1 is a front view of an engine-lathe apron provided with my improved gearing. Fig. 2 is a reverse or back View of the same. Fig. 3 is an end view of a lathe frame and carriage, showing the method of attaching the apron and gearing, said apron and gearing being in section on the lines a: a; and y y. Fig. 4 is a sectional detail on the line as :0.

Similar letters of reference in the difierent figures indicate corresponding parts.

A is an ordinary lathe-frame 5 B, an apron; and O is the carriage.

Referring to Fig. 3,'the apron and gearing are shown from D to E as being in section on the line y y, and from E to F as a section on the line a; no.

a is the lead-screw. Gearing into this screw are four tangent-wheels, c c and a 0, two of which are shown in section in Fig. 3. These wheels are attached to the shafts i i, on the other end of which are fastened the four common spur-wheels, cl djd cl, two of which are shown in section in Fig. 3. The pair of wheels d placed in the same line vertically gear together, as shown in Fig. 1, while the two lower wheels 01 are connected in a horizontal line by an intermediate pinion, m. In thisway it will be seen that the. four tangent-wheels inside the apron are all connected by the screw a,

that meshes into each, and the four spur wheels cl outside the apron are all connected also. The small pinion m answers a double function by connecting the two lower wheels d, and moves the whole train by means of the hand-wheelf, to which this fiinion is connected. By revolving the screw it all these wheels 0 and d are set inmotio'n, also the intermediate pinion, m, and hand-wheel f1 When these are in motion the carriage O and apron B will be stationary; but as soon as the motion of these wheels, either 0 or d, is arrested, then the front wheels, 0 and 0, become in eflect a screwnut, and the carriage C is moved along the same as in the case of a common lathe. The pinion m and flange n are formed solid, and together with the hand-wheel f are mounted loose on the stud h, being kept on by the thumb-nutg. If this nut g is screwed. up, the flange a presses on all four of the wheels cl, pressing them against the face of the apron B and arresting their motion by friction. This retards or stops the whole train of wheels 0, c, and d, converting the wheels 0 0 into a screw-nut, as before explained. In this way it will be seen the carriage O can be moved back or forward by the wheel f the same as if a rack and pinion were employed, and that by arresting their motion the carriage starts instantly, but not positively unless the thumbnut g is screwed up firmly.

Having thus described my invention, what I claim is- 1. In combination with the carriage of an en gine-lathe, two or moretangent-wheels meshing into the lead-screw, substantially as shown and described.

2. In combination with the carriage of an engine-lathe, two or more tangent-wheels connected by spur-wheels, substantially as shown and described.

.3. In combination with an en gine-lathe carriage, an outer and inner train of gearing, con nected and operating substantially as shown and described;

4.. In combination with the carriage of an engine-lathe, two or more tangent wheels connected with friction devices for retarding or arresting their motion, substantially as shown engine-lathe, a train of connected spur and vided with flange n, and the hand-wheelfand 1o tangent wheels and a friction-clutch, snbstannut g, substantially as shown and described.

tially as shown and described. In testimony whereof I afiix my signature in 6. In an engine-lathe, the combination, with presence of two witnesses. 5 the carriage U, apron B, and lead-screw a of the tangent gear-wheels c c, meshing with H D said screw, and provided with shafts i i, ear- Witnesses: rying spur-wheels d d, the pinion on, gearing E. R. STEVENS, with the lower pair of spur-wheels, and pro- D. J. PADDOGK. 

